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WO2000037914A9 |
A fiber grating pressure sensor includes an optical sensing element (20, 600) which includes an optical fiber (10) having a Bragg grating (12) impressed therein which is encased within and fused to at least a portion of a glass capillary...
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WO/2001/014843A1 |
A fiber optic pressure sensor has an optic fiber (1) with at least two Faser-Bragg-gratings (10, 11, 12) and a pressure transfer element (2) consisting of a pressure body (3) and a reference body (4). Said pressure body (3) and reference...
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WO/2000/068645A1 |
The device according to the present invention includes an optical sensing device including first and second lightguides positioned side by side, and preferably covered as a unit with a layer of transmissive material, wherein the lightgui...
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WO2000000799A9 |
Non-intrusive pressure sensors (14-18) for measuring unsteady pressures within a pipe (12) include an optical fiber (10) wrapped in coils (20-24) around the circumference of the pipe (12). The length or change in the length of the coils ...
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WO/2000/039552A1 |
The invention relates to a fibre laser pressure sensor (1) which is suitable in particular for the measurement of differential pressures and flow velocities v¿1? in oil boreholes. The fibre laser (2) provided for in the invention compri...
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WO/2000/039553A1 |
The invention relates to a fibre Bragg-grating sensor (1, 25) which is suitable notably for the measurement of differential pressures and flow velocities v¿1? in oil boreholes. The operating principle of the sensor provided for in the i...
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WO/2000/039551A1 |
A pressure sensor comprises a diaphragm (6) with a first surface that receives pressure, and a thermal detector (3) having a heat-sensitive resistor opposed to the diaphragm with a spacer between. Since the quantity of displacement of th...
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WO/2000/037910A1 |
The invention relates to a sensor having a signal source for emitting a physical signal and a signal detector mounted at a distance from said signal source for receiving the physical signals in the location of the signal detector. The ph...
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WO/2000/036386A1 |
The present invention relates to protecting optical devices, such as an optical fibre sensor connected in series with a cable, from a hostile environment, such as encountered when making measurements in oil and gas wells. A liquid can pr...
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WO/2000/033048A2 |
A fiber optic Bragg grating pressure sensor particularly suited for measuring ambient pressure of a fluid includes a pressuring detecting device (12) such as a glass element whose elastic deformation is proportional to applied pressure. ...
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WO/2000/027282A1 |
A method of determining the air pressure in a lung, comprising: making a determination of the velocity of sound in the lung; and estimating the pressure within the lung based on the determined velocity.
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WO/2000/025304A1 |
A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal comprises a signal preemphasis filter, a synthesis filter claculator, and a perceptual weighting filter. The signal preemphasis f...
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WO/2000/025103A1 |
The apparatus of the present invention includes an optical fiber with a Bragg grating formed along a portion of its core and a mechanical structure arranged adjacent to the Bragg grating for amplifying transverse strain on the fiber in t...
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WO/2000/025298A1 |
An improved pitch search method and device for digitally encoding a wideband signal, in particular but not exclusively a speech signal, in view of transmitting, or storing, and synthesizing this wideband sound signal. The new method and ...
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WO/2000/025305A1 |
In a method and device for recovering the high frequency content of a wideband signal previously down-sampled during encoding, and for injecting, during decoding, this high frequency content in an over-sampled synthesized version of the ...
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WO/2000/025303A1 |
The present invention relates to a method and device for enhancing periodicity of an excitation signal produced in relation to a pitch codevector and an innovative codevector for supplying a signal synthesis filter in view of producing a...
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WO/2000/001296A1 |
A planar pressure transducer is disclosed which is useful for interposing between living tissue and a medical device that applies pressure to the tissue in order to estimate the pressure applied to a selected area of the tissue. The plan...
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WO/1999/066299A1 |
The present invention pertains to the field pressure-measuring techniques using optical systems, and may be used in various technical fields, mainly in medicine. The pressure sensor of the present invention comprises a Fabry-Pérot reson...
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WO/1999/063303A1 |
This invention refers to a differential transducer for measuring the curvature variations of a surface such as a surface of a diaphragm (5). According to the invention it comprises: an assembly of two L-shaped optical elements (6, 7) who...
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WO/1999/057589A1 |
A creep-resistant optical fiber attachment includes an optical waveguide (10), such as an optical fiber, having a cladding (12) and a core (14), having a variation region (16) (expanded or recessed) of an outer dimension of the waveguide...
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WO/1999/046605A1 |
The invention relates to a measuring device with at least one microsensor (5). The at least one microsensor has at least two chambers (20, 30) which are filled with a gas. Said chambers (20, 30) are interconnected by at least one channel...
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WO/1999/045352A1 |
Optical pressure sensor comprising an optical fibre (1) having a well defined end part (1A) and a casing (3) having a cylindrically shaped cavity with essentially the same diameter as the optical fiber (1), the end (1A) of the optical fi...
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WO/1999/044023A1 |
The invention relates to a frequency-coded fibre laser pressure sensor (1) which is especially suitable for measuring isotropic pressures in oil wells. The sensor principle provided for in the invention is based on the fact that in a fib...
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WO/1999/044026A1 |
The invention relates to a wavelength-coded pressure sensor (1) with fibre-integrated Bragg grating, which is especially suitable for use at high pressures and temperatures in oil wells. The sensor principle provided for in the invention...
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WO/1999/035478A1 |
An apparatus for measuring the differential pressure between at least two fluids including: (a) first and second pressure enclosures; (b) first and second pressure deformable members where the first deformable member is sealingly connect...
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WO/1999/032863A1 |
A method is disclosed, for application of an optical fibre with a core (1) and a cladding (2) as a hydrostatic pressure sensor. A fibre-optic Bragg grating (5) is written into the core (1) of the optical fibre and two side-holes (3) are ...
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WO/1999/027339A1 |
A detector for the internal presure of an air-filled gunwale protector which can reduce the maintenance work. The internal pressure detector is composed of internal pressure detection units (10) which are provided in the air-filled gunwa...
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WO/1999/013979A1 |
A microwave vessel system for external and noninvasive pressure monitoring and control is disclosed. The system comprises a reaction vessel (21) formed of a material that is transparent to microwave radiation, with the reaction vessel (2...
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WO/1999/013307A1 |
A pressure sensor capable of measuring pressure in a harsh environment includes at least one intrinsic fiber optic sensor element formed within a core of an optical fiber. A length of the optical fiber containing the sensor element is at...
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WO/1999/004234A1 |
A pressure sensor and associated pressure sensing process relies on detecting multiply scattered light or other wave-propagating energy within an optical cavity or other integrating sphere. The interior of the cavity comprises either a l...
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WO/1999/002953A1 |
A fiber optic pressure transducer having enhanced resolution and dynamic range includes a fiber optic core having one or more gratings written onto it, a birefringence structure for enhancing the birefringence of the core, and a structur...
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WO/1999/000652A1 |
A Bourdon tube pressure gauge is mounted for sensing the pressure of a system. The Bourdon tube is connected to at least one optical strain sensor mounted to be strained by movement of the Bourdon tube such that when the Bourdon tube is ...
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WO/1999/000653A2 |
Device (100) for measurement of pressure in fluids, comprising a cylindrical housing (101) having a pressure port (103), an inner cavity (102) and an opening (102b). A closed pipe (131) is situated in the cavity (102) and closes the open...
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WO/1998/056292A1 |
The invention relates to a sensor system for measuring pressurized sections. Such systems can be used wherever pressure is distributed in one or two dimensions and requires measurement. One particular field of application is medicine, wh...
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WO/1998/053292A1 |
A method for analyzing the internal pressure of a closed container (12) includes inducing vibration in a surface (26) of sealed container or can (12); detecting sound resulting from sealed vibration of such container (12); deriving infor...
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WO/1998/043058A1 |
The invention relates to a pressure measuring device which is used as a heat conductivity manometer and contains a precision resistor (131) which is arranged in layers on a self-supporting carrier film and is in defined thermal contact w...
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WO/1998/032378A1 |
The invention provides a non-invasive method and apparatus for improved ultrasonic imaging and for measurement of ambient pressure, temperature or gas concentration using non-invasive ultrasound contrast imaging techniques.
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WO/1998/029657A1 |
A shape memory device includes a shape memory alloy member configured to have at least a portion of the shape memory alloy member be selectively activated. A heating device is coupled to the member and configured to provide heat to a sel...
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WO/1998/020388A1 |
Devices that comprise novel, mesoscopically periodic materials that combine crystalline colloidal array (CCA) self assembly with the temperature induced volume phase transistions of various, materials, preferably poly (N-isopropylacrylam...
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WO/1997/043614A1 |
A photoelastic force sensor comprising a sensor plate or disk bonded by means of diffusion or reactive bonding of identical or like materials onto a first face of a spacer ring which defines an aperture. The spacer ring also has an appro...
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WO/1997/040350A1 |
There is described a device that is useful in determining pressure gradients in liquids, for instance. Pressure sensing is effected with the aid of two sensors (7, 8) mounted at a predetermined distance apart, wherein the membranes (9, 1...
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WO/1997/039334A1 |
A method of determining pressure requires that a three-dimensional surface of an object (14) be covered with a pressure sensitive coating. Next a raw first image (74) is acquired while the object (14) is not under test and a raw second i...
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WO/1997/039318A1 |
A system (50) for determining strain includes: a stimulating light source (54, 56); a device (64) for placing stress on an object (58); a number of local strain gauges (66) attached to the object (58); and an image capturing device (62, ...
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WO/1997/013124A1 |
The invention concerns a method of measuring hydrostatic pressure, in particular that of ground water, and is characterized in that air is bubbled into the ground water, the measuring line pressure is applied to an absolute pressure cell...
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WO/1996/041142A1 |
A pressure sensitive paint (24) is coated onto the surface (20) over which a pressure distribution is to be measured. A pressure sensitive paint is a mixture of a silanol-terminated polydimethylsiloxane and methyltriacetoxysilane, and a ...
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WO/1996/036856A1 |
Compensation and health monitoring techniques and devices for fiber optic intensity-modulated sensors provide automatic adjustment of light intensity in order to maintain continuous calibration of the fiber optic sensors in the presence ...
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WO/1996/029585A1 |
A cladded birefringent pressure sensor for use in a pressure-sensing system. The sensor is a single composite plate consisting of two plates (122, 124) each with different indices of refraction. One surface of the sensor is exposed to th...
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WO/1996/028325A1 |
The proposal is for braking pressure regulator. It comprises a brake pressure detector (1), a brake actuating device (3) for at least one vehicle wheel, a connecting line (2) between the brake pressure detector (1) and the brake actuatin...
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WO/1996/017234A2 |
A pressure sensor (1) includes a crystalline material (2) and a pressure transmission device (30) to transmit the ambient pressure at the location of the pressure sensor (1) to the crystalline material (2). An input coupling device (4, 5...
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WO/1995/023551A1 |
In a pressure measuring device, in particular for medical pressure measurements, a mechanical pressure sensor is connected to an evaluating electronic system (10) by means of a beam wave guide (3). In order to compensate adulteration of ...
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